change behaviour + add traps

- blades from slit
they cause only dmg when step on slit
blades decay to slit (not slit to blades)
- spikes from strange holes
they cause only dmg when step on spikes (not strange holes)
they should not turn back after stepout
- added jungle maw as trap who cause earthdmg
Merge pull request #824 from Royalot/patch-2

change behaviour + add traps